healthcare facilities in 23 states and so far doctors have reported the infection in these states. tennessee, indiana, virginia, maryland, florida, and north carolina. health officials are now trying to contact people who receive the steroid in the past three months. one hospital in southwestern indiana alone reports more than 500 people received injections. health officials in virginia have also contacted some 500 patients. it could take 2 to 28 days from the time of the injection for people to start feeling symptoms chills, fever, nausea and stroke-like symptoms such as difficulty walking and urinating. jonathan serrie is with the news in atlanta is there a type of patient most at risk here? >> well, the drug in question is used to treat back pain. so, in general, you have an older patient but in general they are otherwise healthy before the contamination. the warning applies to anyone who may have received these tainted injections as far as back as july. any of these folks who develop symptoms should contact their doctor to get tested and determine whether they need to go on an